drivers/net/wireless/iwlwifi/iwl-core.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <net/mac80211.h>
  35
  36 #include "iwl-eeprom.h"
  37 #include "iwl-dev.h" /* FIXME: remove */
  38 #include "iwl-debug.h"
  39 #include "iwl-core.h"
  40 #include "iwl-io.h"
  41 #include "iwl-power.h"
  42 #include "iwl-sta.h"
  43 #include "iwl-helpers.h"
  44 #include "iwl-agn.h"
  45 #include "iwl-trans.h"
  46
  47 u32 iwl_debug_level;
  48
  49 const u8 iwl_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
  50
  51 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
  52 #define MAX_BIT_RATE_20_MHZ 72 /* Mbps */
  53 static void iwlcore_init_ht_hw_capab(const struct iwl_priv *priv,
  54                               struct ieee80211_sta_ht_cap *ht_info,
  55                               enum ieee80211_band band)
  56 {
  57         u16 max_bit_rate = 0;
  58         u8 rx_chains_num = priv->hw_params.rx_chains_num;
  59         u8 tx_chains_num = priv->hw_params.tx_chains_num;
  60
  61         ht_info->cap = 0;
  62         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
  63
  64         ht_info->ht_supported = true;
  65
  66         if (priv->cfg->ht_params &&
  67             priv->cfg->ht_params->ht_greenfield_support)
  68                 ht_info->cap |= IEEE80211_HT_CAP_GRN_FLD;
  69         ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
  70         max_bit_rate = MAX_BIT_RATE_20_MHZ;
  71         if (priv->hw_params.ht40_channel & BIT(band)) {
  72                 ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
  73                 ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
  74                 ht_info->mcs.rx_mask[4] = 0x01;
  75                 max_bit_rate = MAX_BIT_RATE_40_MHZ;
  76         }
  77
  78         if (iwlagn_mod_params.amsdu_size_8K)
  79                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
  80
  81         ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
  82         if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_factor)
  83                 ht_info->ampdu_factor = priv->cfg->bt_params->ampdu_factor;
  84         ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
  85         if (priv->cfg->bt_params && priv->cfg->bt_params->ampdu_density)
  86                 ht_info->ampdu_density = priv->cfg->bt_params->ampdu_density;
  87
  88         ht_info->mcs.rx_mask[0] = 0xFF;
  89         if (rx_chains_num >= 2)
  90                 ht_info->mcs.rx_mask[1] = 0xFF;
  91         if (rx_chains_num >= 3)
  92                 ht_info->mcs.rx_mask[2] = 0xFF;
  93
  94         /* Highest supported Rx data rate */
  95         max_bit_rate *= rx_chains_num;
  96         WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
  97         ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
  98
  99         /* Tx MCS capabilities */
 100         ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
 101         if (tx_chains_num != rx_chains_num) {
 102                 ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
 103                 ht_info->mcs.tx_params |= ((tx_chains_num - 1) <<
 104                                 IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
 105         }
 106 }
 107
 108 /**
 109  * iwlcore_init_geos - Initialize mac80211's geo/channel info based from eeprom
 110  */
 111 int iwlcore_init_geos(struct iwl_priv *priv)
 112 {
 113         struct iwl_channel_info *ch;
 114         struct ieee80211_supported_band *sband;
 115         struct ieee80211_channel *channels;
 116         struct ieee80211_channel *geo_ch;
 117         struct ieee80211_rate *rates;
 118         int i = 0;
 119         s8 max_tx_power = IWLAGN_TX_POWER_TARGET_POWER_MIN;
 120
 121         if (priv->bands[IEEE80211_BAND_2GHZ].n_bitrates ||
 122             priv->bands[IEEE80211_BAND_5GHZ].n_bitrates) {
 123                 IWL_DEBUG_INFO(priv, "Geography modes already initialized.\n");
 124                 set_bit(STATUS_GEO_CONFIGURED, &priv->status);
 125                 return 0;
 126         }
 127
 128         channels = kzalloc(sizeof(struct ieee80211_channel) *
 129                            priv->channel_count, GFP_KERNEL);
 130         if (!channels)
 131                 return -ENOMEM;
 132
 133         rates = kzalloc((sizeof(struct ieee80211_rate) * IWL_RATE_COUNT_LEGACY),
 134                         GFP_KERNEL);
 135         if (!rates) {
 136                 kfree(channels);
 137                 return -ENOMEM;
 138         }
 139
 140         /* 5.2GHz channels start after the 2.4GHz channels */
 141         sband = &priv->bands[IEEE80211_BAND_5GHZ];
 142         sband->channels = &channels[ARRAY_SIZE(iwl_eeprom_band_1)];
 143         /* just OFDM */
 144         sband->bitrates = &rates[IWL_FIRST_OFDM_RATE];
 145         sband->n_bitrates = IWL_RATE_COUNT_LEGACY - IWL_FIRST_OFDM_RATE;
 146
 147         if (priv->cfg->sku & EEPROM_SKU_CAP_11N_ENABLE)
 148                 iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
 149                                          IEEE80211_BAND_5GHZ);
 150
 151         sband = &priv->bands[IEEE80211_BAND_2GHZ];
 152         sband->channels = channels;
 153         /* OFDM & CCK */
 154         sband->bitrates = rates;
 155         sband->n_bitrates = IWL_RATE_COUNT_LEGACY;
 156
 157         if (priv->cfg->sku & EEPROM_SKU_CAP_11N_ENABLE)
 158                 iwlcore_init_ht_hw_capab(priv, &sband->ht_cap,
 159                                          IEEE80211_BAND_2GHZ);
 160
 161         priv->ieee_channels = channels;
 162         priv->ieee_rates = rates;
 163
 164         for (i = 0;  i < priv->channel_count; i++) {
 165                 ch = &priv->channel_info[i];
 166
 167                 /* FIXME: might be removed if scan is OK */
 168                 if (!is_channel_valid(ch))
 169                         continue;
 170
 171                 sband =  &priv->bands[ch->band];
 172
 173                 geo_ch = &sband->channels[sband->n_channels++];
 174
 175                 geo_ch->center_freq =
 176                         ieee80211_channel_to_frequency(ch->channel, ch->band);
 177                 geo_ch->max_power = ch->max_power_avg;
 178                 geo_ch->max_antenna_gain = 0xff;
 179                 geo_ch->hw_value = ch->channel;
 180
 181                 if (is_channel_valid(ch)) {
 182                         if (!(ch->flags & EEPROM_CHANNEL_IBSS))
 183                                 geo_ch->flags |= IEEE80211_CHAN_NO_IBSS;
 184
 185                         if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
 186                                 geo_ch->flags |= IEEE80211_CHAN_PASSIVE_SCAN;
 187
 188                         if (ch->flags & EEPROM_CHANNEL_RADAR)
 189                                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
 190
 191                         geo_ch->flags |= ch->ht40_extension_channel;
 192
 193                         if (ch->max_power_avg > max_tx_power)
 194                                 max_tx_power = ch->max_power_avg;
 195                 } else {
 196                         geo_ch->flags |= IEEE80211_CHAN_DISABLED;
 197                 }
 198
 199                 IWL_DEBUG_INFO(priv, "Channel %d Freq=%d[%sGHz] %s flag=0x%X\n",
 200                                 ch->channel, geo_ch->center_freq,
 201                                 is_channel_a_band(ch) ?  "5.2" : "2.4",
 202                                 geo_ch->flags & IEEE80211_CHAN_DISABLED ?
 203                                 "restricted" : "valid",
 204                                  geo_ch->flags);
 205         }
 206
 207         priv->tx_power_device_lmt = max_tx_power;
 208         priv->tx_power_user_lmt = max_tx_power;
 209         priv->tx_power_next = max_tx_power;
 210
 211         if ((priv->bands[IEEE80211_BAND_5GHZ].n_channels == 0) &&
 212              priv->cfg->sku & EEPROM_SKU_CAP_BAND_52GHZ) {
 213                 char buf[32];
 214                 priv->bus.ops->get_hw_id(&priv->bus, buf, sizeof(buf));
 215                 IWL_INFO(priv, "Incorrectly detected BG card as ABG. "
 216                         "Please send your %s to maintainer.\n", buf);
 217                 priv->cfg->sku &= ~EEPROM_SKU_CAP_BAND_52GHZ;
 218         }
 219
 220         IWL_INFO(priv, "Tunable channels: %d 802.11bg, %d 802.11a channels\n",
 221                    priv->bands[IEEE80211_BAND_2GHZ].n_channels,
 222                    priv->bands[IEEE80211_BAND_5GHZ].n_channels);
 223
 224         set_bit(STATUS_GEO_CONFIGURED, &priv->status);
 225
 226         return 0;
 227 }
 228
 229 /*
 230  * iwlcore_free_geos - undo allocations in iwlcore_init_geos
 231  */
 232 void iwlcore_free_geos(struct iwl_priv *priv)
 233 {
 234         kfree(priv->ieee_channels);
 235         kfree(priv->ieee_rates);
 236         clear_bit(STATUS_GEO_CONFIGURED, &priv->status);
 237 }
 238
 239 static bool iwl_is_channel_extension(struct iwl_priv *priv,
 240                                      enum ieee80211_band band,
 241                                      u16 channel, u8 extension_chan_offset)
 242 {
 243         const struct iwl_channel_info *ch_info;
 244
 245         ch_info = iwl_get_channel_info(priv, band, channel);
 246         if (!is_channel_valid(ch_info))
 247                 return false;
 248
 249         if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
 250                 return !(ch_info->ht40_extension_channel &
 251                                         IEEE80211_CHAN_NO_HT40PLUS);
 252         else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
 253                 return !(ch_info->ht40_extension_channel &
 254                                         IEEE80211_CHAN_NO_HT40MINUS);
 255
 256         return false;
 257 }
 258
 259 bool iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
 260                             struct iwl_rxon_context *ctx,
 261                             struct ieee80211_sta_ht_cap *ht_cap)
 262 {
 263         if (!ctx->ht.enabled || !ctx->ht.is_40mhz)
 264                 return false;
 265
 266         /*
 267          * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
 268          * the bit will not set if it is pure 40MHz case
 269          */
 270         if (ht_cap && !ht_cap->ht_supported)
 271                 return false;
 272
 273 #ifdef CONFIG_IWLWIFI_DEBUGFS
 274         if (priv->disable_ht40)
 275                 return false;
 276 #endif
 277
 278         return iwl_is_channel_extension(priv, priv->band,
 279                         le16_to_cpu(ctx->staging.channel),
 280                         ctx->ht.extension_chan_offset);
 281 }
 282
 283 static u16 iwl_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
 284 {
 285         u16 new_val;
 286         u16 beacon_factor;
 287
 288         /*
 289          * If mac80211 hasn't given us a beacon interval, program
 290          * the default into the device (not checking this here
 291          * would cause the adjustment below to return the maximum
 292          * value, which may break PAN.)
 293          */
 294         if (!beacon_val)
 295                 return DEFAULT_BEACON_INTERVAL;
 296
 297         /*
 298          * If the beacon interval we obtained from the peer
 299          * is too large, we'll have to wake up more often
 300          * (and in IBSS case, we'll beacon too much)
 301          *
 302          * For example, if max_beacon_val is 4096, and the
 303          * requested beacon interval is 7000, we'll have to
 304          * use 3500 to be able to wake up on the beacons.
 305          *
 306          * This could badly influence beacon detection stats.
 307          */
 308
 309         beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
 310         new_val = beacon_val / beacon_factor;
 311
 312         if (!new_val)
 313                 new_val = max_beacon_val;
 314
 315         return new_val;
 316 }
 317
 318 int iwl_send_rxon_timing(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 319 {
 320         u64 tsf;
 321         s32 interval_tm, rem;
 322         struct ieee80211_conf *conf = NULL;
 323         u16 beacon_int;
 324         struct ieee80211_vif *vif = ctx->vif;
 325
 326         conf = ieee80211_get_hw_conf(priv->hw);
 327
 328         lockdep_assert_held(&priv->mutex);
 329
 330         memset(&ctx->timing, 0, sizeof(struct iwl_rxon_time_cmd));
 331
 332         ctx->timing.timestamp = cpu_to_le64(priv->timestamp);
 333         ctx->timing.listen_interval = cpu_to_le16(conf->listen_interval);
 334
 335         beacon_int = vif ? vif->bss_conf.beacon_int : 0;
 336
 337         /*
 338          * TODO: For IBSS we need to get atim_window from mac80211,
 339          *       for now just always use 0
 340          */
 341         ctx->timing.atim_window = 0;
 342
 343         if (ctx->ctxid == IWL_RXON_CTX_PAN &&
 344             (!ctx->vif || ctx->vif->type != NL80211_IFTYPE_STATION) &&
 345             iwl_is_associated(priv, IWL_RXON_CTX_BSS) &&
 346             priv->contexts[IWL_RXON_CTX_BSS].vif &&
 347             priv->contexts[IWL_RXON_CTX_BSS].vif->bss_conf.beacon_int) {
 348                 ctx->timing.beacon_interval =
 349                         priv->contexts[IWL_RXON_CTX_BSS].timing.beacon_interval;
 350                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 351         } else if (ctx->ctxid == IWL_RXON_CTX_BSS &&
 352                    iwl_is_associated(priv, IWL_RXON_CTX_PAN) &&
 353                    priv->contexts[IWL_RXON_CTX_PAN].vif &&
 354                    priv->contexts[IWL_RXON_CTX_PAN].vif->bss_conf.beacon_int &&
 355                    (!iwl_is_associated_ctx(ctx) || !ctx->vif ||
 356                     !ctx->vif->bss_conf.beacon_int)) {
 357                 ctx->timing.beacon_interval =
 358                         priv->contexts[IWL_RXON_CTX_PAN].timing.beacon_interval;
 359                 beacon_int = le16_to_cpu(ctx->timing.beacon_interval);
 360         } else {
 361                 beacon_int = iwl_adjust_beacon_interval(beacon_int,
 362                                 priv->hw_params.max_beacon_itrvl * TIME_UNIT);
 363                 ctx->timing.beacon_interval = cpu_to_le16(beacon_int);
 364         }
 365
 366         tsf = priv->timestamp; /* tsf is modifed by do_div: copy it */
 367         interval_tm = beacon_int * TIME_UNIT;
 368         rem = do_div(tsf, interval_tm);
 369         ctx->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
 370
 371         ctx->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ?: 1) : 1;
 372
 373         IWL_DEBUG_ASSOC(priv,
 374                         "beacon interval %d beacon timer %d beacon tim %d\n",
 375                         le16_to_cpu(ctx->timing.beacon_interval),
 376                         le32_to_cpu(ctx->timing.beacon_init_val),
 377                         le16_to_cpu(ctx->timing.atim_window));
 378
 379         return trans_send_cmd_pdu(priv, ctx->rxon_timing_cmd,
 380                                 CMD_SYNC, sizeof(ctx->timing), &ctx->timing);
 381 }
 382
 383 void iwl_set_rxon_hwcrypto(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 384                            int hw_decrypt)
 385 {
 386         struct iwl_rxon_cmd *rxon = &ctx->staging;
 387
 388         if (hw_decrypt)
 389                 rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
 390         else
 391                 rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
 392
 393 }
 394
 395 /* validate RXON structure is valid */
 396 int iwl_check_rxon_cmd(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
 397 {
 398         struct iwl_rxon_cmd *rxon = &ctx->staging;
 399         u32 errors = 0;
 400
 401         if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
 402                 if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
 403                         IWL_WARN(priv, "check 2.4G: wrong narrow\n");
 404                         errors |= BIT(0);
 405                 }
 406                 if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
 407                         IWL_WARN(priv, "check 2.4G: wrong radar\n");
 408                         errors |= BIT(1);
 409                 }
 410         } else {
 411                 if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
 412                         IWL_WARN(priv, "check 5.2G: not short slot!\n");
 413                         errors |= BIT(2);
 414                 }
 415                 if (rxon->flags & RXON_FLG_CCK_MSK) {
 416                         IWL_WARN(priv, "check 5.2G: CCK!\n");
 417                         errors |= BIT(3);
 418                 }
 419         }
 420         if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
 421                 IWL_WARN(priv, "mac/bssid mcast!\n");
 422                 errors |= BIT(4);
 423         }
 424
 425         /* make sure basic rates 6Mbps and 1Mbps are supported */
 426         if ((rxon->ofdm_basic_rates & IWL_RATE_6M_MASK) == 0 &&
 427             (rxon->cck_basic_rates & IWL_RATE_1M_MASK) == 0) {
 428                 IWL_WARN(priv, "neither 1 nor 6 are basic\n");
 429                 errors |= BIT(5);
 430         }
 431
 432         if (le16_to_cpu(rxon->assoc_id) > 2007) {
 433                 IWL_WARN(priv, "aid > 2007\n");
 434                 errors |= BIT(6);
 435         }
 436
 437         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK))
 438                         == (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
 439                 IWL_WARN(priv, "CCK and short slot\n");
 440                 errors |= BIT(7);
 441         }
 442
 443         if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK))
 444                         == (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
 445                 IWL_WARN(priv, "CCK and auto detect");
 446                 errors |= BIT(8);
 447         }
 448
 449         if ((rxon->flags & (RXON_FLG_AUTO_DETECT_MSK |
 450                             RXON_FLG_TGG_PROTECT_MSK)) ==
 451                             RXON_FLG_TGG_PROTECT_MSK) {
 452                 IWL_WARN(priv, "TGg but no auto-detect\n");
 453                 errors |= BIT(9);
 454         }
 455
 456         if (rxon->channel == 0) {
 457                 IWL_WARN(priv, "zero channel is invalid\n");
 458                 errors |= BIT(10);
 459         }
 460
 461         WARN(errors, "Invalid RXON (%#x), channel %d",
 462              errors, le16_to_cpu(rxon->channel));
 463
 464         return errors ? -EINVAL : 0;
 465 }
 466
 467 /**
 468  * iwl_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
 469  * @priv: staging_rxon is compared to active_rxon
 470  *
 471  * If the RXON structure is changing enough to require a new tune,
 472  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
 473  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
 474  */
 475 int iwl_full_rxon_required(struct iwl_priv *priv,
 476                            struct iwl_rxon_context *ctx)
 477 {
 478         const struct iwl_rxon_cmd *staging = &ctx->staging;
 479         const struct iwl_rxon_cmd *active = &ctx->active;
 480
 481 #define CHK(cond)                                                       \
 482         if ((cond)) {                                                   \
 483                 IWL_DEBUG_INFO(priv, "need full RXON - " #cond "\n");   \
 484                 return 1;                                               \
 485         }
 486
 487 #define CHK_NEQ(c1, c2)                                         \
 488         if ((c1) != (c2)) {                                     \
 489                 IWL_DEBUG_INFO(priv, "need full RXON - "        \
 490                                #c1 " != " #c2 " - %d != %d\n",  \
 491                                (c1), (c2));                     \
 492                 return 1;                                       \
 493         }
 494
 495         /* These items are only settable from the full RXON command */
 496         CHK(!iwl_is_associated_ctx(ctx));
 497         CHK(compare_ether_addr(staging->bssid_addr, active->bssid_addr));
 498         CHK(compare_ether_addr(staging->node_addr, active->node_addr));
 499         CHK(compare_ether_addr(staging->wlap_bssid_addr,
 500                                 active->wlap_bssid_addr));
 501         CHK_NEQ(staging->dev_type, active->dev_type);
 502         CHK_NEQ(staging->channel, active->channel);
 503         CHK_NEQ(staging->air_propagation, active->air_propagation);
 504         CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
 505                 active->ofdm_ht_single_stream_basic_rates);
 506         CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
 507                 active->ofdm_ht_dual_stream_basic_rates);
 508         CHK_NEQ(staging->ofdm_ht_triple_stream_basic_rates,
 509                 active->ofdm_ht_triple_stream_basic_rates);
 510         CHK_NEQ(staging->assoc_id, active->assoc_id);
 511
 512         /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
 513          * be updated with the RXON_ASSOC command -- however only some
 514          * flag transitions are allowed using RXON_ASSOC */
 515
 516         /* Check if we are not switching bands */
 517         CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
 518                 active->flags & RXON_FLG_BAND_24G_MSK);
 519
 520         /* Check if we are switching association toggle */
 521         CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
 522                 active->filter_flags & RXON_FILTER_ASSOC_MSK);
 523
 524 #undef CHK
 525 #undef CHK_NEQ
 526
 527         return 0;
 528 }
 529
 530 static void _iwl_set_rxon_ht(struct iwl_priv *priv,
 531                              struct iwl_ht_config *ht_conf,
 532                              struct iwl_rxon_context *ctx)
 533 {
 534         struct iwl_rxon_cmd *rxon = &ctx->staging;
 535
 536         if (!ctx->ht.enabled) {
 537                 rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 538                         RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
 539                         RXON_FLG_HT40_PROT_MSK |
 540                         RXON_FLG_HT_PROT_MSK);
 541                 return;
 542         }
 543
 544         /* FIXME: if the definition of ht.protection changed, the "translation"
 545          * will be needed for rxon->flags
 546          */
 547         rxon->flags |= cpu_to_le32(ctx->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
 548
 549         /* Set up channel bandwidth:
 550          * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
 551         /* clear the HT channel mode before set the mode */
 552         rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
 553                          RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 554         if (iwl_is_ht40_tx_allowed(priv, ctx, NULL)) {
 555                 /* pure ht40 */
 556                 if (ctx->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
 557                         rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
 558                         /* Note: control channel is opposite of extension channel */
 559                         switch (ctx->ht.extension_chan_offset) {
 560                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 561                                 rxon->flags &= ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 562                                 break;
 563                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 564                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 565                                 break;
 566                         }
 567                 } else {
 568                         /* Note: control channel is opposite of extension channel */
 569                         switch (ctx->ht.extension_chan_offset) {
 570                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 571                                 rxon->flags &= ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
 572                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 573                                 break;
 574                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 575                                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
 576                                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
 577                                 break;
 578                         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
 579                         default:
 580                                 /* channel location only valid if in Mixed mode */
 581                                 IWL_ERR(priv, "invalid extension channel offset\n");
 582                                 break;
 583                         }
 584                 }
 585         } else {
 586                 rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
 587         }
 588
 589         iwlagn_set_rxon_chain(priv, ctx);
 590
 591         IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
 592                         "extension channel offset 0x%x\n",
 593                         le32_to_cpu(rxon->flags), ctx->ht.protection,
 594                         ctx->ht.extension_chan_offset);
 595 }
 596
 597 void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
 598 {
 599         struct iwl_rxon_context *ctx;
 600
 601         for_each_context(priv, ctx)
 602                 _iwl_set_rxon_ht(priv, ht_conf, ctx);
 603 }
 604
 605 /* Return valid, unused, channel for a passive scan to reset the RF */
 606 u8 iwl_get_single_channel_number(struct iwl_priv *priv,
 607                                  enum ieee80211_band band)
 608 {
 609         const struct iwl_channel_info *ch_info;
 610         int i;
 611         u8 channel = 0;
 612         u8 min, max;
 613         struct iwl_rxon_context *ctx;
 614
 615         if (band == IEEE80211_BAND_5GHZ) {
 616                 min = 14;
 617                 max = priv->channel_count;
 618         } else {
 619                 min = 0;
 620                 max = 14;
 621         }
 622
 623         for (i = min; i < max; i++) {
 624                 bool busy = false;
 625
 626                 for_each_context(priv, ctx) {
 627                         busy = priv->channel_info[i].channel ==
 628                                 le16_to_cpu(ctx->staging.channel);
 629                         if (busy)
 630                                 break;
 631                 }
 632
 633                 if (busy)
 634                         continue;
 635
 636                 channel = priv->channel_info[i].channel;
 637                 ch_info = iwl_get_channel_info(priv, band, channel);
 638                 if (is_channel_valid(ch_info))
 639                         break;
 640         }
 641
 642         return channel;
 643 }
 644
 645 /**
 646  * iwl_set_rxon_channel - Set the band and channel values in staging RXON
 647  * @ch: requested channel as a pointer to struct ieee80211_channel
 648
 649  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
 650  * in the staging RXON flag structure based on the ch->band
 651  */
 652 int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch,
 653                          struct iwl_rxon_context *ctx)
 654 {
 655         enum ieee80211_band band = ch->band;
 656         u16 channel = ch->hw_value;
 657
 658         if ((le16_to_cpu(ctx->staging.channel) == channel) &&
 659             (priv->band == band))
 660                 return 0;
 661
 662         ctx->staging.channel = cpu_to_le16(channel);
 663         if (band == IEEE80211_BAND_5GHZ)
 664                 ctx->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
 665         else
 666                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 667
 668         priv->band = band;
 669
 670         IWL_DEBUG_INFO(priv, "Staging channel set to %d [%d]\n", channel, band);
 671
 672         return 0;
 673 }
 674
 675 void iwl_set_flags_for_band(struct iwl_priv *priv,
 676                             struct iwl_rxon_context *ctx,
 677                             enum ieee80211_band band,
 678                             struct ieee80211_vif *vif)
 679 {
 680         if (band == IEEE80211_BAND_5GHZ) {
 681                 ctx->staging.flags &=
 682                     ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK
 683                       | RXON_FLG_CCK_MSK);
 684                 ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 685         } else {
 686                 /* Copied from iwl_post_associate() */
 687                 if (vif && vif->bss_conf.use_short_slot)
 688                         ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
 689                 else
 690                         ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 691
 692                 ctx->staging.flags |= RXON_FLG_BAND_24G_MSK;
 693                 ctx->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
 694                 ctx->staging.flags &= ~RXON_FLG_CCK_MSK;
 695         }
 696 }
 697
 698 /*
 699  * initialize rxon structure with default values from eeprom
 700  */
 701 void iwl_connection_init_rx_config(struct iwl_priv *priv,
 702                                    struct iwl_rxon_context *ctx)
 703 {
 704         const struct iwl_channel_info *ch_info;
 705
 706         memset(&ctx->staging, 0, sizeof(ctx->staging));
 707
 708         if (!ctx->vif) {
 709                 ctx->staging.dev_type = ctx->unused_devtype;
 710         } else switch (ctx->vif->type) {
 711         case NL80211_IFTYPE_AP:
 712                 ctx->staging.dev_type = ctx->ap_devtype;
 713                 break;
 714
 715         case NL80211_IFTYPE_STATION:
 716                 ctx->staging.dev_type = ctx->station_devtype;
 717                 ctx->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
 718                 break;
 719
 720         case NL80211_IFTYPE_ADHOC:
 721                 ctx->staging.dev_type = ctx->ibss_devtype;
 722                 ctx->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
 723                 ctx->staging.filter_flags = RXON_FILTER_BCON_AWARE_MSK |
 724                                                   RXON_FILTER_ACCEPT_GRP_MSK;
 725                 break;
 726
 727         default:
 728                 IWL_ERR(priv, "Unsupported interface type %d\n",
 729                         ctx->vif->type);
 730                 break;
 731         }
 732
 733 #if 0
 734         /* TODO:  Figure out when short_preamble would be set and cache from
 735          * that */
 736         if (!hw_to_local(priv->hw)->short_preamble)
 737                 ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
 738         else
 739                 ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 740 #endif
 741
 742         ch_info = iwl_get_channel_info(priv, priv->band,
 743                                        le16_to_cpu(ctx->active.channel));
 744
 745         if (!ch_info)
 746                 ch_info = &priv->channel_info[0];
 747
 748         ctx->staging.channel = cpu_to_le16(ch_info->channel);
 749         priv->band = ch_info->band;
 750
 751         iwl_set_flags_for_band(priv, ctx, priv->band, ctx->vif);
 752
 753         ctx->staging.ofdm_basic_rates =
 754             (IWL_OFDM_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 755         ctx->staging.cck_basic_rates =
 756             (IWL_CCK_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 757
 758         /* clear both MIX and PURE40 mode flag */
 759         ctx->staging.flags &= ~(RXON_FLG_CHANNEL_MODE_MIXED |
 760                                         RXON_FLG_CHANNEL_MODE_PURE_40);
 761         if (ctx->vif)
 762                 memcpy(ctx->staging.node_addr, ctx->vif->addr, ETH_ALEN);
 763
 764         ctx->staging.ofdm_ht_single_stream_basic_rates = 0xff;
 765         ctx->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
 766         ctx->staging.ofdm_ht_triple_stream_basic_rates = 0xff;
 767 }
 768
 769 void iwl_set_rate(struct iwl_priv *priv)
 770 {
 771         const struct ieee80211_supported_band *hw = NULL;
 772         struct ieee80211_rate *rate;
 773         struct iwl_rxon_context *ctx;
 774         int i;
 775
 776         hw = iwl_get_hw_mode(priv, priv->band);
 777         if (!hw) {
 778                 IWL_ERR(priv, "Failed to set rate: unable to get hw mode\n");
 779                 return;
 780         }
 781
 782         priv->active_rate = 0;
 783
 784         for (i = 0; i < hw->n_bitrates; i++) {
 785                 rate = &(hw->bitrates[i]);
 786                 if (rate->hw_value < IWL_RATE_COUNT_LEGACY)
 787                         priv->active_rate |= (1 << rate->hw_value);
 788         }
 789
 790         IWL_DEBUG_RATE(priv, "Set active_rate = %0x\n", priv->active_rate);
 791
 792         for_each_context(priv, ctx) {
 793                 ctx->staging.cck_basic_rates =
 794                     (IWL_CCK_BASIC_RATES_MASK >> IWL_FIRST_CCK_RATE) & 0xF;
 795
 796                 ctx->staging.ofdm_basic_rates =
 797                    (IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
 798         }
 799 }
 800
 801 void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
 802 {
 803         /*
 804          * MULTI-FIXME
 805          * See iwl_mac_channel_switch.
 806          */
 807         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 808
 809         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 810                 return;
 811
 812         if (test_and_clear_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
 813                 ieee80211_chswitch_done(ctx->vif, is_success);
 814 }
 815
 816 #ifdef CONFIG_IWLWIFI_DEBUG
 817 void iwl_print_rx_config_cmd(struct iwl_priv *priv,
 818                              struct iwl_rxon_context *ctx)
 819 {
 820         struct iwl_rxon_cmd *rxon = &ctx->staging;
 821
 822         IWL_DEBUG_RADIO(priv, "RX CONFIG:\n");
 823         iwl_print_hex_dump(priv, IWL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
 824         IWL_DEBUG_RADIO(priv, "u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
 825         IWL_DEBUG_RADIO(priv, "u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
 826         IWL_DEBUG_RADIO(priv, "u32 filter_flags: 0x%08x\n",
 827                         le32_to_cpu(rxon->filter_flags));
 828         IWL_DEBUG_RADIO(priv, "u8 dev_type: 0x%x\n", rxon->dev_type);
 829         IWL_DEBUG_RADIO(priv, "u8 ofdm_basic_rates: 0x%02x\n",
 830                         rxon->ofdm_basic_rates);
 831         IWL_DEBUG_RADIO(priv, "u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
 832         IWL_DEBUG_RADIO(priv, "u8[6] node_addr: %pM\n", rxon->node_addr);
 833         IWL_DEBUG_RADIO(priv, "u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
 834         IWL_DEBUG_RADIO(priv, "u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
 835 }
 836 #endif
 837
 838 static void iwlagn_abort_notification_waits(struct iwl_priv *priv)
 839 {
 840         unsigned long flags;
 841         struct iwl_notification_wait *wait_entry;
 842
 843         spin_lock_irqsave(&priv->_agn.notif_wait_lock, flags);
 844         list_for_each_entry(wait_entry, &priv->_agn.notif_waits, list)
 845                 wait_entry->aborted = true;
 846         spin_unlock_irqrestore(&priv->_agn.notif_wait_lock, flags);
 847
 848         wake_up_all(&priv->_agn.notif_waitq);
 849 }
 850
 851 void iwlagn_fw_error(struct iwl_priv *priv, bool ondemand)
 852 {
 853         unsigned int reload_msec;
 854         unsigned long reload_jiffies;
 855
 856         /* Set the FW error flag -- cleared on iwl_down */
 857         set_bit(STATUS_FW_ERROR, &priv->status);
 858
 859         /* Cancel currently queued command. */
 860         clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 861
 862         iwlagn_abort_notification_waits(priv);
 863
 864         /* Keep the restart process from trying to send host
 865          * commands by clearing the ready bit */
 866         clear_bit(STATUS_READY, &priv->status);
 867
 868         wake_up_interruptible(&priv->wait_command_queue);
 869
 870         if (!ondemand) {
 871                 /*
 872                  * If firmware keep reloading, then it indicate something
 873                  * serious wrong and firmware having problem to recover
 874                  * from it. Instead of keep trying which will fill the syslog
 875                  * and hang the system, let's just stop it
 876                  */
 877                 reload_jiffies = jiffies;
 878                 reload_msec = jiffies_to_msecs((long) reload_jiffies -
 879                                         (long) priv->reload_jiffies);
 880                 priv->reload_jiffies = reload_jiffies;
 881                 if (reload_msec <= IWL_MIN_RELOAD_DURATION) {
 882                         priv->reload_count++;
 883                         if (priv->reload_count >= IWL_MAX_CONTINUE_RELOAD_CNT) {
 884                                 IWL_ERR(priv, "BUG_ON, Stop restarting\n");
 885                                 return;
 886                         }
 887                 } else
 888                         priv->reload_count = 0;
 889         }
 890
 891         if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) {
 892                 if (iwlagn_mod_params.restart_fw) {
 893                         IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
 894                                   "Restarting adapter due to uCode error.\n");
 895                         queue_work(priv->workqueue, &priv->restart);
 896                 } else
 897                         IWL_DEBUG(priv, IWL_DL_FW_ERRORS,
 898                                   "Detected FW error, but not restarting\n");
 899         }
 900 }
 901
 902 /**
 903  * iwl_irq_handle_error - called for HW or SW error interrupt from card
 904  */
 905 void iwl_irq_handle_error(struct iwl_priv *priv)
 906 {
 907         /* W/A for WiFi/WiMAX coex and WiMAX own the RF */
 908         if (priv->cfg->internal_wimax_coex &&
 909             (!(iwl_read_prph(priv, APMG_CLK_CTRL_REG) &
 910                         APMS_CLK_VAL_MRB_FUNC_MODE) ||
 911              (iwl_read_prph(priv, APMG_PS_CTRL_REG) &
 912                         APMG_PS_CTRL_VAL_RESET_REQ))) {
 913                 /*
 914                  * Keep the restart process from trying to send host
 915                  * commands by clearing the ready bit.
 916                  */
 917                 clear_bit(STATUS_READY, &priv->status);
 918                 clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
 919                 wake_up_interruptible(&priv->wait_command_queue);
 920                 IWL_ERR(priv, "RF is used by WiMAX\n");
 921                 return;
 922         }
 923
 924         IWL_ERR(priv, "Loaded firmware version: %s\n",
 925                 priv->hw->wiphy->fw_version);
 926
 927         iwl_dump_nic_error_log(priv);
 928         iwl_dump_csr(priv);
 929         iwl_dump_fh(priv, NULL, false);
 930         iwl_dump_nic_event_log(priv, false, NULL, false);
 931 #ifdef CONFIG_IWLWIFI_DEBUG
 932         if (iwl_get_debug_level(priv) & IWL_DL_FW_ERRORS)
 933                 iwl_print_rx_config_cmd(priv,
 934                                         &priv->contexts[IWL_RXON_CTX_BSS]);
 935 #endif
 936
 937         iwlagn_fw_error(priv, false);
 938 }
 939
 940 static int iwl_apm_stop_master(struct iwl_priv *priv)
 941 {
 942         int ret = 0;
 943
 944         /* stop device's busmaster DMA activity */
 945         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
 946
 947         ret = iwl_poll_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
 948                         CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
 949         if (ret)
 950                 IWL_WARN(priv, "Master Disable Timed Out, 100 usec\n");
 951
 952         IWL_DEBUG_INFO(priv, "stop master\n");
 953
 954         return ret;
 955 }
 956
 957 void iwl_apm_stop(struct iwl_priv *priv)
 958 {
 959         IWL_DEBUG_INFO(priv, "Stop card, put in low power state\n");
 960
 961         clear_bit(STATUS_DEVICE_ENABLED, &priv->status);
 962
 963         /* Stop device's DMA activity */
 964         iwl_apm_stop_master(priv);
 965
 966         /* Reset the entire device */
 967         iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
 968
 969         udelay(10);
 970
 971         /*
 972          * Clear "initialization complete" bit to move adapter from
 973          * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
 974          */
 975         iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 976 }
 977
 978
 979 /*
 980  * Start up NIC's basic functionality after it has been reset
 981  * (e.g. after platform boot, or shutdown via iwl_apm_stop())
 982  * NOTE:  This does not load uCode nor start the embedded processor
 983  */
 984 int iwl_apm_init(struct iwl_priv *priv)
 985 {
 986         int ret = 0;
 987         IWL_DEBUG_INFO(priv, "Init card's basic functions\n");
 988
 989         /*
 990          * Use "set_bit" below rather than "write", to preserve any hardware
 991          * bits already set by default after reset.
 992          */
 993
 994         /* Disable L0S exit timer (platform NMI Work/Around) */
 995         iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
 996                           CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
 997
 998         /*
 999          * Disable L0s without affecting L1;
1000          *  don't wait for ICH L0s (ICH bug W/A)
1001          */
1002         iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
1003                           CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
1004
1005         /* Set FH wait threshold to maximum (HW error during stress W/A) */
1006         iwl_set_bit(priv, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
1007
1008         /*
1009          * Enable HAP INTA (interrupt from management bus) to
1010          * wake device's PCI Express link L1a -> L0s
1011          */
1012         iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
1013                                     CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
1014
1015         priv->bus.ops->apm_config(&priv->bus);
1016
1017         /* Configure analog phase-lock-loop before activating to D0A */
1018         if (priv->cfg->base_params->pll_cfg_val)
1019                 iwl_set_bit(priv, CSR_ANA_PLL_CFG,
1020                             priv->cfg->base_params->pll_cfg_val);
1021
1022         /*
1023          * Set "initialization complete" bit to move adapter from
1024          * D0U* --> D0A* (powered-up active) state.
1025          */
1026         iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
1027
1028         /*
1029          * Wait for clock stabilization; once stabilized, access to
1030          * device-internal resources is supported, e.g. iwl_write_prph()
1031          * and accesses to uCode SRAM.
1032          */
1033         ret = iwl_poll_bit(priv, CSR_GP_CNTRL,
1034                         CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
1035                         CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
1036         if (ret < 0) {
1037                 IWL_DEBUG_INFO(priv, "Failed to init the card\n");
1038                 goto out;
1039         }
1040
1041         /*
1042          * Enable DMA clock and wait for it to stabilize.
1043          *
1044          * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
1045          * do not disable clocks.  This preserves any hardware bits already
1046          * set by default in "CLK_CTRL_REG" after reset.
1047          */
1048         iwl_write_prph(priv, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
1049         udelay(20);
1050
1051         /* Disable L1-Active */
1052         iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
1053                           APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
1054
1055         set_bit(STATUS_DEVICE_ENABLED, &priv->status);
1056
1057 out:
1058         return ret;
1059 }
1060
1061
1062 int iwl_set_tx_power(struct iwl_priv *priv, s8 tx_power, bool force)
1063 {
1064         int ret;
1065         s8 prev_tx_power;
1066         bool defer;
1067         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
1068
1069         lockdep_assert_held(&priv->mutex);
1070
1071         if (priv->tx_power_user_lmt == tx_power && !force)
1072                 return 0;
1073
1074         if (tx_power < IWLAGN_TX_POWER_TARGET_POWER_MIN) {
1075                 IWL_WARN(priv,
1076                          "Requested user TXPOWER %d below lower limit %d.\n",
1077                          tx_power,
1078                          IWLAGN_TX_POWER_TARGET_POWER_MIN);
1079                 return -EINVAL;
1080         }
1081
1082         if (tx_power > priv->tx_power_device_lmt) {
1083                 IWL_WARN(priv,
1084                         "Requested user TXPOWER %d above upper limit %d.\n",
1085                          tx_power, priv->tx_power_device_lmt);
1086                 return -EINVAL;
1087         }
1088
1089         if (!iwl_is_ready_rf(priv))
1090                 return -EIO;
1091
1092         /* scan complete and commit_rxon use tx_power_next value,
1093          * it always need to be updated for newest request */
1094         priv->tx_power_next = tx_power;
1095
1096         /* do not set tx power when scanning or channel changing */
1097         defer = test_bit(STATUS_SCANNING, &priv->status) ||
1098                 memcmp(&ctx->active, &ctx->staging, sizeof(ctx->staging));
1099         if (defer && !force) {
1100                 IWL_DEBUG_INFO(priv, "Deferring tx power set\n");
1101                 return 0;
1102         }
1103
1104         prev_tx_power = priv->tx_power_user_lmt;
1105         priv->tx_power_user_lmt = tx_power;
1106
1107         ret = iwlagn_send_tx_power(priv);
1108
1109         /* if fail to set tx_power, restore the orig. tx power */
1110         if (ret) {
1111                 priv->tx_power_user_lmt = prev_tx_power;
1112                 priv->tx_power_next = prev_tx_power;
1113         }
1114         return ret;
1115 }
1116
1117 void iwl_send_bt_config(struct iwl_priv *priv)
1118 {
1119         struct iwl_bt_cmd bt_cmd = {
1120                 .lead_time = BT_LEAD_TIME_DEF,
1121                 .max_kill = BT_MAX_KILL_DEF,
1122                 .kill_ack_mask = 0,
1123                 .kill_cts_mask = 0,
1124         };
1125
1126         if (!iwlagn_mod_params.bt_coex_active)
1127                 bt_cmd.flags = BT_COEX_DISABLE;
1128         else
1129                 bt_cmd.flags = BT_COEX_ENABLE;
1130
1131         priv->bt_enable_flag = bt_cmd.flags;
1132         IWL_DEBUG_INFO(priv, "BT coex %s\n",
1133                 (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
1134
1135         if (trans_send_cmd_pdu(priv, REPLY_BT_CONFIG,
1136                              CMD_SYNC, sizeof(struct iwl_bt_cmd), &bt_cmd))
1137                 IWL_ERR(priv, "failed to send BT Coex Config\n");
1138 }
1139
1140 int iwl_send_statistics_request(struct iwl_priv *priv, u8 flags, bool clear)
1141 {
1142         struct iwl_statistics_cmd statistics_cmd = {
1143                 .configuration_flags =
1144                         clear ? IWL_STATS_CONF_CLEAR_STATS : 0,
1145         };
1146
1147         if (flags & CMD_ASYNC)
1148                 return trans_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
1149                                               CMD_ASYNC,
1150                                                sizeof(struct iwl_statistics_cmd),
1151                                                &statistics_cmd);
1152         else
1153                 return trans_send_cmd_pdu(priv, REPLY_STATISTICS_CMD,
1154                                         CMD_SYNC,
1155                                         sizeof(struct iwl_statistics_cmd),
1156                                         &statistics_cmd);
1157 }
1158
1159 void iwl_clear_isr_stats(struct iwl_priv *priv)
1160 {
1161         memset(&priv->isr_stats, 0, sizeof(priv->isr_stats));
1162 }
1163
1164 int iwl_mac_conf_tx(struct ieee80211_hw *hw, u16 queue,
1165                            const struct ieee80211_tx_queue_params *params)
1166 {
1167         struct iwl_priv *priv = hw->priv;
1168         struct iwl_rxon_context *ctx;
1169         unsigned long flags;
1170         int q;
1171
1172         IWL_DEBUG_MAC80211(priv, "enter\n");
1173
1174         if (!iwl_is_ready_rf(priv)) {
1175                 IWL_DEBUG_MAC80211(priv, "leave - RF not ready\n");
1176                 return -EIO;
1177         }
1178
1179         if (queue >= AC_NUM) {
1180                 IWL_DEBUG_MAC80211(priv, "leave - queue >= AC_NUM %d\n", queue);
1181                 return 0;
1182         }
1183
1184         q = AC_NUM - 1 - queue;
1185
1186         spin_lock_irqsave(&priv->lock, flags);
1187
1188         /*
1189          * MULTI-FIXME
1190          * This may need to be done per interface in nl80211/cfg80211/mac80211.
1191          */
1192         for_each_context(priv, ctx) {
1193                 ctx->qos_data.def_qos_parm.ac[q].cw_min =
1194                         cpu_to_le16(params->cw_min);
1195                 ctx->qos_data.def_qos_parm.ac[q].cw_max =
1196                         cpu_to_le16(params->cw_max);
1197                 ctx->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
1198                 ctx->qos_data.def_qos_parm.ac[q].edca_txop =
1199                                 cpu_to_le16((params->txop * 32));
1200
1201                 ctx->qos_data.def_qos_parm.ac[q].reserved1 = 0;
1202         }
1203
1204         spin_unlock_irqrestore(&priv->lock, flags);
1205
1206         IWL_DEBUG_MAC80211(priv, "leave\n");
1207         return 0;
1208 }
1209
1210 int iwl_mac_tx_last_beacon(struct ieee80211_hw *hw)
1211 {
1212         struct iwl_priv *priv = hw->priv;
1213
1214         return priv->ibss_manager == IWL_IBSS_MANAGER;
1215 }
1216
1217 static int iwl_set_mode(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
1218 {
1219         iwl_connection_init_rx_config(priv, ctx);
1220
1221         iwlagn_set_rxon_chain(priv, ctx);
1222
1223         return iwlagn_commit_rxon(priv, ctx);
1224 }
1225
1226 static int iwl_setup_interface(struct iwl_priv *priv,
1227                                struct iwl_rxon_context *ctx)
1228 {
1229         struct ieee80211_vif *vif = ctx->vif;
1230         int err;
1231
1232         lockdep_assert_held(&priv->mutex);
1233
1234         /*
1235          * This variable will be correct only when there's just
1236          * a single context, but all code using it is for hardware
1237          * that supports only one context.
1238          */
1239         priv->iw_mode = vif->type;
1240
1241         ctx->is_active = true;
1242
1243         err = iwl_set_mode(priv, ctx);
1244         if (err) {
1245                 if (!ctx->always_active)
1246                         ctx->is_active = false;
1247                 return err;
1248         }
1249
1250         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist &&
1251             vif->type == NL80211_IFTYPE_ADHOC) {
1252                 /*
1253                  * pretend to have high BT traffic as long as we
1254                  * are operating in IBSS mode, as this will cause
1255                  * the rate scaling etc. to behave as intended.
1256                  */
1257                 priv->bt_traffic_load = IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
1258         }
1259
1260         return 0;
1261 }
1262
1263 int iwl_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
1264 {
1265         struct iwl_priv *priv = hw->priv;
1266         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
1267         struct iwl_rxon_context *tmp, *ctx = NULL;
1268         int err;
1269         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(vif);
1270
1271         IWL_DEBUG_MAC80211(priv, "enter: type %d, addr %pM\n",
1272                            viftype, vif->addr);
1273
1274         mutex_lock(&priv->mutex);
1275
1276         if (!iwl_is_ready_rf(priv)) {
1277                 IWL_WARN(priv, "Try to add interface when device not ready\n");
1278                 err = -EINVAL;
1279                 goto out;
1280         }
1281
1282         for_each_context(priv, tmp) {
1283                 u32 possible_modes =
1284                         tmp->interface_modes | tmp->exclusive_interface_modes;
1285
1286                 if (tmp->vif) {
1287                         /* check if this busy context is exclusive */
1288                         if (tmp->exclusive_interface_modes &
1289                                                 BIT(tmp->vif->type)) {
1290                                 err = -EINVAL;
1291                                 goto out;
1292                         }
1293                         continue;
1294                 }
1295
1296                 if (!(possible_modes & BIT(viftype)))
1297                         continue;
1298
1299                 /* have maybe usable context w/o interface */
1300                 ctx = tmp;
1301                 break;
1302         }
1303
1304         if (!ctx) {
1305                 err = -EOPNOTSUPP;
1306                 goto out;
1307         }
1308
1309         vif_priv->ctx = ctx;
1310         ctx->vif = vif;
1311
1312         err = iwl_setup_interface(priv, ctx);
1313         if (!err)
1314                 goto out;
1315
1316         ctx->vif = NULL;
1317         priv->iw_mode = NL80211_IFTYPE_STATION;
1318  out:
1319         mutex_unlock(&priv->mutex);
1320
1321         IWL_DEBUG_MAC80211(priv, "leave\n");
1322         return err;
1323 }
1324
1325 static void iwl_teardown_interface(struct iwl_priv *priv,
1326                                    struct ieee80211_vif *vif,
1327                                    bool mode_change)
1328 {
1329         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1330
1331         lockdep_assert_held(&priv->mutex);
1332
1333         if (priv->scan_vif == vif) {
1334                 iwl_scan_cancel_timeout(priv, 200);
1335                 iwl_force_scan_end(priv);
1336         }
1337
1338         if (!mode_change) {
1339                 iwl_set_mode(priv, ctx);
1340                 if (!ctx->always_active)
1341                         ctx->is_active = false;
1342         }
1343
1344         /*
1345          * When removing the IBSS interface, overwrite the
1346          * BT traffic load with the stored one from the last
1347          * notification, if any. If this is a device that
1348          * doesn't implement this, this has no effect since
1349          * both values are the same and zero.
1350          */
1351         if (vif->type == NL80211_IFTYPE_ADHOC)
1352                 priv->bt_traffic_load = priv->last_bt_traffic_load;
1353 }
1354
1355 void iwl_mac_remove_interface(struct ieee80211_hw *hw,
1356                               struct ieee80211_vif *vif)
1357 {
1358         struct iwl_priv *priv = hw->priv;
1359         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1360
1361         IWL_DEBUG_MAC80211(priv, "enter\n");
1362
1363         mutex_lock(&priv->mutex);
1364
1365         WARN_ON(ctx->vif != vif);
1366         ctx->vif = NULL;
1367
1368         iwl_teardown_interface(priv, vif, false);
1369
1370         mutex_unlock(&priv->mutex);
1371
1372         IWL_DEBUG_MAC80211(priv, "leave\n");
1373
1374 }
1375
1376 #ifdef CONFIG_IWLWIFI_DEBUGFS
1377
1378 #define IWL_TRAFFIC_DUMP_SIZE   (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)
1379
1380 void iwl_reset_traffic_log(struct iwl_priv *priv)
1381 {
1382         priv->tx_traffic_idx = 0;
1383         priv->rx_traffic_idx = 0;
1384         if (priv->tx_traffic)
1385                 memset(priv->tx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
1386         if (priv->rx_traffic)
1387                 memset(priv->rx_traffic, 0, IWL_TRAFFIC_DUMP_SIZE);
1388 }
1389
1390 int iwl_alloc_traffic_mem(struct iwl_priv *priv)
1391 {
1392         u32 traffic_size = IWL_TRAFFIC_DUMP_SIZE;
1393
1394         if (iwl_debug_level & IWL_DL_TX) {
1395                 if (!priv->tx_traffic) {
1396                         priv->tx_traffic =
1397                                 kzalloc(traffic_size, GFP_KERNEL);
1398                         if (!priv->tx_traffic)
1399                                 return -ENOMEM;
1400                 }
1401         }
1402         if (iwl_debug_level & IWL_DL_RX) {
1403                 if (!priv->rx_traffic) {
1404                         priv->rx_traffic =
1405                                 kzalloc(traffic_size, GFP_KERNEL);
1406                         if (!priv->rx_traffic)
1407                                 return -ENOMEM;
1408                 }
1409         }
1410         iwl_reset_traffic_log(priv);
1411         return 0;
1412 }
1413
1414 void iwl_free_traffic_mem(struct iwl_priv *priv)
1415 {
1416         kfree(priv->tx_traffic);
1417         priv->tx_traffic = NULL;
1418
1419         kfree(priv->rx_traffic);
1420         priv->rx_traffic = NULL;
1421 }
1422
1423 void iwl_dbg_log_tx_data_frame(struct iwl_priv *priv,
1424                       u16 length, struct ieee80211_hdr *header)
1425 {
1426         __le16 fc;
1427         u16 len;
1428
1429         if (likely(!(iwl_debug_level & IWL_DL_TX)))
1430                 return;
1431
1432         if (!priv->tx_traffic)
1433                 return;
1434
1435         fc = header->frame_control;
1436         if (ieee80211_is_data(fc)) {
1437                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
1438                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
1439                 memcpy((priv->tx_traffic +
1440                        (priv->tx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
1441                        header, len);
1442                 priv->tx_traffic_idx =
1443                         (priv->tx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
1444         }
1445 }
1446
1447 void iwl_dbg_log_rx_data_frame(struct iwl_priv *priv,
1448                       u16 length, struct ieee80211_hdr *header)
1449 {
1450         __le16 fc;
1451         u16 len;
1452
1453         if (likely(!(iwl_debug_level & IWL_DL_RX)))
1454                 return;
1455
1456         if (!priv->rx_traffic)
1457                 return;
1458
1459         fc = header->frame_control;
1460         if (ieee80211_is_data(fc)) {
1461                 len = (length > IWL_TRAFFIC_ENTRY_SIZE)
1462                        ? IWL_TRAFFIC_ENTRY_SIZE : length;
1463                 memcpy((priv->rx_traffic +
1464                        (priv->rx_traffic_idx * IWL_TRAFFIC_ENTRY_SIZE)),
1465                        header, len);
1466                 priv->rx_traffic_idx =
1467                         (priv->rx_traffic_idx + 1) % IWL_TRAFFIC_ENTRIES;
1468         }
1469 }
1470
1471 const char *get_mgmt_string(int cmd)
1472 {
1473         switch (cmd) {
1474                 IWL_CMD(MANAGEMENT_ASSOC_REQ);
1475                 IWL_CMD(MANAGEMENT_ASSOC_RESP);
1476                 IWL_CMD(MANAGEMENT_REASSOC_REQ);
1477                 IWL_CMD(MANAGEMENT_REASSOC_RESP);
1478                 IWL_CMD(MANAGEMENT_PROBE_REQ);
1479                 IWL_CMD(MANAGEMENT_PROBE_RESP);
1480                 IWL_CMD(MANAGEMENT_BEACON);
1481                 IWL_CMD(MANAGEMENT_ATIM);
1482                 IWL_CMD(MANAGEMENT_DISASSOC);
1483                 IWL_CMD(MANAGEMENT_AUTH);
1484                 IWL_CMD(MANAGEMENT_DEAUTH);
1485                 IWL_CMD(MANAGEMENT_ACTION);
1486         default:
1487                 return "UNKNOWN";
1488
1489         }
1490 }
1491
1492 const char *get_ctrl_string(int cmd)
1493 {
1494         switch (cmd) {
1495                 IWL_CMD(CONTROL_BACK_REQ);
1496                 IWL_CMD(CONTROL_BACK);
1497                 IWL_CMD(CONTROL_PSPOLL);
1498                 IWL_CMD(CONTROL_RTS);
1499                 IWL_CMD(CONTROL_CTS);
1500                 IWL_CMD(CONTROL_ACK);
1501                 IWL_CMD(CONTROL_CFEND);
1502                 IWL_CMD(CONTROL_CFENDACK);
1503         default:
1504                 return "UNKNOWN";
1505
1506         }
1507 }
1508
1509 void iwl_clear_traffic_stats(struct iwl_priv *priv)
1510 {
1511         memset(&priv->tx_stats, 0, sizeof(struct traffic_stats));
1512         memset(&priv->rx_stats, 0, sizeof(struct traffic_stats));
1513 }
1514
1515 /*
1516  * if CONFIG_IWLWIFI_DEBUGFS defined, iwl_update_stats function will
1517  * record all the MGMT, CTRL and DATA pkt for both TX and Rx pass.
1518  * Use debugFs to display the rx/rx_statistics
1519  * if CONFIG_IWLWIFI_DEBUGFS not being defined, then no MGMT and CTRL
1520  * information will be recorded, but DATA pkt still will be recorded
1521  * for the reason of iwl_led.c need to control the led blinking based on
1522  * number of tx and rx data.
1523  *
1524  */
1525 void iwl_update_stats(struct iwl_priv *priv, bool is_tx, __le16 fc, u16 len)
1526 {
1527         struct traffic_stats    *stats;
1528
1529         if (is_tx)
1530                 stats = &priv->tx_stats;
1531         else
1532                 stats = &priv->rx_stats;
1533
1534         if (ieee80211_is_mgmt(fc)) {
1535                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1536                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
1537                         stats->mgmt[MANAGEMENT_ASSOC_REQ]++;
1538                         break;
1539                 case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
1540                         stats->mgmt[MANAGEMENT_ASSOC_RESP]++;
1541                         break;
1542                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
1543                         stats->mgmt[MANAGEMENT_REASSOC_REQ]++;
1544                         break;
1545                 case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
1546                         stats->mgmt[MANAGEMENT_REASSOC_RESP]++;
1547                         break;
1548                 case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ):
1549                         stats->mgmt[MANAGEMENT_PROBE_REQ]++;
1550                         break;
1551                 case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP):
1552                         stats->mgmt[MANAGEMENT_PROBE_RESP]++;
1553                         break;
1554                 case cpu_to_le16(IEEE80211_STYPE_BEACON):
1555                         stats->mgmt[MANAGEMENT_BEACON]++;
1556                         break;
1557                 case cpu_to_le16(IEEE80211_STYPE_ATIM):
1558                         stats->mgmt[MANAGEMENT_ATIM]++;
1559                         break;
1560                 case cpu_to_le16(IEEE80211_STYPE_DISASSOC):
1561                         stats->mgmt[MANAGEMENT_DISASSOC]++;
1562                         break;
1563                 case cpu_to_le16(IEEE80211_STYPE_AUTH):
1564                         stats->mgmt[MANAGEMENT_AUTH]++;
1565                         break;
1566                 case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
1567                         stats->mgmt[MANAGEMENT_DEAUTH]++;
1568                         break;
1569                 case cpu_to_le16(IEEE80211_STYPE_ACTION):
1570                         stats->mgmt[MANAGEMENT_ACTION]++;
1571                         break;
1572                 }
1573         } else if (ieee80211_is_ctl(fc)) {
1574                 switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
1575                 case cpu_to_le16(IEEE80211_STYPE_BACK_REQ):
1576                         stats->ctrl[CONTROL_BACK_REQ]++;
1577                         break;
1578                 case cpu_to_le16(IEEE80211_STYPE_BACK):
1579                         stats->ctrl[CONTROL_BACK]++;
1580                         break;
1581                 case cpu_to_le16(IEEE80211_STYPE_PSPOLL):
1582                         stats->ctrl[CONTROL_PSPOLL]++;
1583                         break;
1584                 case cpu_to_le16(IEEE80211_STYPE_RTS):
1585                         stats->ctrl[CONTROL_RTS]++;
1586                         break;
1587                 case cpu_to_le16(IEEE80211_STYPE_CTS):
1588                         stats->ctrl[CONTROL_CTS]++;
1589                         break;
1590                 case cpu_to_le16(IEEE80211_STYPE_ACK):
1591                         stats->ctrl[CONTROL_ACK]++;
1592                         break;
1593                 case cpu_to_le16(IEEE80211_STYPE_CFEND):
1594                         stats->ctrl[CONTROL_CFEND]++;
1595                         break;
1596                 case cpu_to_le16(IEEE80211_STYPE_CFENDACK):
1597                         stats->ctrl[CONTROL_CFENDACK]++;
1598                         break;
1599                 }
1600         } else {
1601                 /* data */
1602                 stats->data_cnt++;
1603                 stats->data_bytes += len;
1604         }
1605 }
1606 #endif
1607
1608 static void iwl_force_rf_reset(struct iwl_priv *priv)
1609 {
1610         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1611                 return;
1612
1613         if (!iwl_is_any_associated(priv)) {
1614                 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n");
1615                 return;
1616         }
1617         /*
1618          * There is no easy and better way to force reset the radio,
1619          * the only known method is switching channel which will force to
1620          * reset and tune the radio.
1621          * Use internal short scan (single channel) operation to should
1622          * achieve this objective.
1623          * Driver should reset the radio when number of consecutive missed
1624          * beacon, or any other uCode error condition detected.
1625          */
1626         IWL_DEBUG_INFO(priv, "perform radio reset.\n");
1627         iwl_internal_short_hw_scan(priv);
1628 }
1629
1630
1631 int iwl_force_reset(struct iwl_priv *priv, int mode, bool external)
1632 {
1633         struct iwl_force_reset *force_reset;
1634
1635         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1636                 return -EINVAL;
1637
1638         if (mode >= IWL_MAX_FORCE_RESET) {
1639                 IWL_DEBUG_INFO(priv, "invalid reset request.\n");
1640                 return -EINVAL;
1641         }
1642         force_reset = &priv->force_reset[mode];
1643         force_reset->reset_request_count++;
1644         if (!external) {
1645                 if (force_reset->last_force_reset_jiffies &&
1646                     time_after(force_reset->last_force_reset_jiffies +
1647                     force_reset->reset_duration, jiffies)) {
1648                         IWL_DEBUG_INFO(priv, "force reset rejected\n");
1649                         force_reset->reset_reject_count++;
1650                         return -EAGAIN;
1651                 }
1652         }
1653         force_reset->reset_success_count++;
1654         force_reset->last_force_reset_jiffies = jiffies;
1655         IWL_DEBUG_INFO(priv, "perform force reset (%d)\n", mode);
1656         switch (mode) {
1657         case IWL_RF_RESET:
1658                 iwl_force_rf_reset(priv);
1659                 break;
1660         case IWL_FW_RESET:
1661                 /*
1662                  * if the request is from external(ex: debugfs),
1663                  * then always perform the request in regardless the module
1664                  * parameter setting
1665                  * if the request is from internal (uCode error or driver
1666                  * detect failure), then fw_restart module parameter
1667                  * need to be check before performing firmware reload
1668                  */
1669                 if (!external && !iwlagn_mod_params.restart_fw) {
1670                         IWL_DEBUG_INFO(priv, "Cancel firmware reload based on "
1671                                        "module parameter setting\n");
1672                         break;
1673                 }
1674                 IWL_ERR(priv, "On demand firmware reload\n");
1675                 iwlagn_fw_error(priv, true);
1676                 break;
1677         }
1678         return 0;
1679 }
1680
1681 int iwl_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
1682                              enum nl80211_iftype newtype, bool newp2p)
1683 {
1684         struct iwl_priv *priv = hw->priv;
1685         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
1686         struct iwl_rxon_context *bss_ctx = &priv->contexts[IWL_RXON_CTX_BSS];
1687         struct iwl_rxon_context *tmp;
1688         enum nl80211_iftype newviftype = newtype;
1689         u32 interface_modes;
1690         int err;
1691
1692         newtype = ieee80211_iftype_p2p(newtype, newp2p);
1693
1694         mutex_lock(&priv->mutex);
1695
1696         if (!ctx->vif || !iwl_is_ready_rf(priv)) {
1697                 /*
1698                  * Huh? But wait ... this can maybe happen when
1699                  * we're in the middle of a firmware restart!
1700                  */
1701                 err = -EBUSY;
1702                 goto out;
1703         }
1704
1705         interface_modes = ctx->interface_modes | ctx->exclusive_interface_modes;
1706
1707         if (!(interface_modes & BIT(newtype))) {
1708                 err = -EBUSY;
1709                 goto out;
1710         }
1711
1712         /*
1713          * Refuse a change that should be done by moving from the PAN
1714          * context to the BSS context instead, if the BSS context is
1715          * available and can support the new interface type.
1716          */
1717         if (ctx->ctxid == IWL_RXON_CTX_PAN && !bss_ctx->vif &&
1718             (bss_ctx->interface_modes & BIT(newtype) ||
1719              bss_ctx->exclusive_interface_modes & BIT(newtype))) {
1720                 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
1721                 err = -EBUSY;
1722                 goto out;
1723         }
1724
1725         if (ctx->exclusive_interface_modes & BIT(newtype)) {
1726                 for_each_context(priv, tmp) {
1727                         if (ctx == tmp)
1728                                 continue;
1729
1730                         if (!tmp->vif)
1731                                 continue;
1732
1733                         /*
1734                          * The current mode switch would be exclusive, but
1735                          * another context is active ... refuse the switch.
1736                          */
1737                         err = -EBUSY;
1738                         goto out;
1739                 }
1740         }
1741
1742         /* success */
1743         iwl_teardown_interface(priv, vif, true);
1744         vif->type = newviftype;
1745         vif->p2p = newp2p;
1746         err = iwl_setup_interface(priv, ctx);
1747         WARN_ON(err);
1748         /*
1749          * We've switched internally, but submitting to the
1750          * device may have failed for some reason. Mask this
1751          * error, because otherwise mac80211 will not switch
1752          * (and set the interface type back) and we'll be
1753          * out of sync with it.
1754          */
1755         err = 0;
1756
1757  out:
1758         mutex_unlock(&priv->mutex);
1759         return err;
1760 }
1761
1762 /*
1763  * On every watchdog tick we check (latest) time stamp. If it does not
1764  * change during timeout period and queue is not empty we reset firmware.
1765  */
1766 static int iwl_check_stuck_queue(struct iwl_priv *priv, int cnt)
1767 {
1768         struct iwl_tx_queue *txq = &priv->txq[cnt];
1769         struct iwl_queue *q = &txq->q;
1770         unsigned long timeout;
1771         int ret;
1772
1773         if (q->read_ptr == q->write_ptr) {
1774                 txq->time_stamp = jiffies;
1775                 return 0;
1776         }
1777
1778         timeout = txq->time_stamp +
1779                   msecs_to_jiffies(priv->cfg->base_params->wd_timeout);
1780
1781         if (time_after(jiffies, timeout)) {
1782                 IWL_ERR(priv, "Queue %d stuck for %u ms.\n",
1783                                 q->id, priv->cfg->base_params->wd_timeout);
1784                 ret = iwl_force_reset(priv, IWL_FW_RESET, false);
1785                 return (ret == -EAGAIN) ? 0 : 1;
1786         }
1787
1788         return 0;
1789 }
1790
1791 /*
1792  * Making watchdog tick be a quarter of timeout assure we will
1793  * discover the queue hung between timeout and 1.25*timeout
1794  */
1795 #define IWL_WD_TICK(timeout) ((timeout) / 4)
1796
1797 /*
1798  * Watchdog timer callback, we check each tx queue for stuck, if if hung
1799  * we reset the firmware. If everything is fine just rearm the timer.
1800  */
1801 void iwl_bg_watchdog(unsigned long data)
1802 {
1803         struct iwl_priv *priv = (struct iwl_priv *)data;
1804         int cnt;
1805         unsigned long timeout;
1806
1807         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
1808                 return;
1809
1810         timeout = priv->cfg->base_params->wd_timeout;
1811         if (timeout == 0)
1812                 return;
1813
1814         /* monitor and check for stuck cmd queue */
1815         if (iwl_check_stuck_queue(priv, priv->cmd_queue))
1816                 return;
1817
1818         /* monitor and check for other stuck queues */
1819         if (iwl_is_any_associated(priv)) {
1820                 for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
1821                         /* skip as we already checked the command queue */
1822                         if (cnt == priv->cmd_queue)
1823                                 continue;
1824                         if (iwl_check_stuck_queue(priv, cnt))
1825                                 return;
1826                 }
1827         }
1828
1829         mod_timer(&priv->watchdog, jiffies +
1830                   msecs_to_jiffies(IWL_WD_TICK(timeout)));
1831 }
1832
1833 void iwl_setup_watchdog(struct iwl_priv *priv)
1834 {
1835         unsigned int timeout = priv->cfg->base_params->wd_timeout;
1836
1837         if (timeout && !iwlagn_mod_params.wd_disable)
1838                 mod_timer(&priv->watchdog,
1839                           jiffies + msecs_to_jiffies(IWL_WD_TICK(timeout)));
1840         else
1841                 del_timer(&priv->watchdog);
1842 }
1843
1844 /*
1845  * extended beacon time format
1846  * time in usec will be changed into a 32-bit value in extended:internal format
1847  * the extended part is the beacon counts
1848  * the internal part is the time in usec within one beacon interval
1849  */
1850 u32 iwl_usecs_to_beacons(struct iwl_priv *priv, u32 usec, u32 beacon_interval)
1851 {
1852         u32 quot;
1853         u32 rem;
1854         u32 interval = beacon_interval * TIME_UNIT;
1855
1856         if (!interval || !usec)
1857                 return 0;
1858
1859         quot = (usec / interval) &
1860                 (iwl_beacon_time_mask_high(priv,
1861                 priv->hw_params.beacon_time_tsf_bits) >>
1862                 priv->hw_params.beacon_time_tsf_bits);
1863         rem = (usec % interval) & iwl_beacon_time_mask_low(priv,
1864                                    priv->hw_params.beacon_time_tsf_bits);
1865
1866         return (quot << priv->hw_params.beacon_time_tsf_bits) + rem;
1867 }
1868
1869 /* base is usually what we get from ucode with each received frame,
1870  * the same as HW timer counter counting down
1871  */
1872 __le32 iwl_add_beacon_time(struct iwl_priv *priv, u32 base,
1873                            u32 addon, u32 beacon_interval)
1874 {
1875         u32 base_low = base & iwl_beacon_time_mask_low(priv,
1876                                         priv->hw_params.beacon_time_tsf_bits);
1877         u32 addon_low = addon & iwl_beacon_time_mask_low(priv,
1878                                         priv->hw_params.beacon_time_tsf_bits);
1879         u32 interval = beacon_interval * TIME_UNIT;
1880         u32 res = (base & iwl_beacon_time_mask_high(priv,
1881                                 priv->hw_params.beacon_time_tsf_bits)) +
1882                                 (addon & iwl_beacon_time_mask_high(priv,
1883                                 priv->hw_params.beacon_time_tsf_bits));
1884
1885         if (base_low > addon_low)
1886                 res += base_low - addon_low;
1887         else if (base_low < addon_low) {
1888                 res += interval + base_low - addon_low;
1889                 res += (1 << priv->hw_params.beacon_time_tsf_bits);
1890         } else
1891                 res += (1 << priv->hw_params.beacon_time_tsf_bits);
1892
1893         return cpu_to_le32(res);
1894 }
1895
1896 #ifdef CONFIG_PM
1897
1898 int iwl_suspend(struct iwl_priv *priv)
1899 {
1900         /*
1901          * This function is called when system goes into suspend state
1902          * mac80211 will call iwl_mac_stop() from the mac80211 suspend function
1903          * first but since iwl_mac_stop() has no knowledge of who the caller is,
1904          * it will not call apm_ops.stop() to stop the DMA operation.
1905          * Calling apm_ops.stop here to make sure we stop the DMA.
1906          */
1907         iwl_apm_stop(priv);
1908
1909         return 0;
1910 }
1911
1912 int iwl_resume(struct iwl_priv *priv)
1913 {
1914         bool hw_rfkill = false;
1915
1916         iwl_enable_interrupts(priv);
1917
1918         if (!(iwl_read32(priv, CSR_GP_CNTRL) &
1919                                 CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
1920                 hw_rfkill = true;
1921
1922         if (hw_rfkill)
1923                 set_bit(STATUS_RF_KILL_HW, &priv->status);
1924         else
1925                 clear_bit(STATUS_RF_KILL_HW, &priv->status);
1926
1927         wiphy_rfkill_set_hw_state(priv->hw->wiphy, hw_rfkill);
1928
1929         return 0;
1930 }
1931
1932 #endif /* CONFIG_PM */